Info blocks on knowledge base, subspaces, dashboard to be editable from the block itself

[SimoneZaza]

Description

As a space admin I want to change this default text that appears on the top left of my Subspaces page and my Knowledge base As a space admin I want the block on the dashboard to not hold the same text as in my future vision

Acceptance criteria

• [x] Edit in context? Edit icon on the block?
• [x] Default text for these blocks
• [x] Dashboard description to be decoupled from the future vision context field

Designs: https://www.figma.com/design/IOJdWGF5Bxmh69NUWl2Ws4/Info-Blocks-to-be-Editable?node-id=0-1&t=ORs7SPfXjc3aQloj-1

Additional Context

Screen shots / UX designs / data that are relevant.